Grandparents Day, September 10, 9am – 5pm. Celebrate Grandparents Day at the Montgomery Zoo. All grandparents receive FREE admission to the Montgomery Zoo and the Mann Wildlife Learning Museum. Join us for Grandparents Day. Last admission at 4pm. For more information, please visit montgomeryzoo.com or call (334) 625-4905. Montgomery Zoo / Mann Museum, 2301 Coliseum Parkway, Montgomery, AL 36110